CA2194394A1 - Control symbol and data symbol guard intervals with different time lengths in cofdm transmission frames - Google Patents

Control symbol and data symbol guard intervals with different time lengths in cofdm transmission frames

Info

Publication number
CA2194394A1
CA2194394A1 CA002194394A CA2194394A CA2194394A1 CA 2194394 A1 CA2194394 A1 CA 2194394A1 CA 002194394 A CA002194394 A CA 002194394A CA 2194394 A CA2194394 A CA 2194394A CA 2194394 A1 CA2194394 A1 CA 2194394A1
Authority
CA
Canada
Prior art keywords
intervals
data symbol
symbol
different time
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002194394A
Other languages
French (fr)
Other versions
CA2194394C (en
Inventor
Christfried Weck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2194394A1 publication Critical patent/CA2194394A1/en
Application granted granted Critical
Publication of CA2194394C publication Critical patent/CA2194394C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radio Transmission System (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Television Systems (AREA)
  • Near-Field Transmission Systems (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Waveguides (AREA)
  • Transmitters (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Circuits Of Receivers In General (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Small-Scale Networks (AREA)
  • Handcart (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

In order to prevent wanted signal capacity from being reduced during OFDM
modulation of digital coded data, control symbol protecting intervals in the frame head of each OFDM transmission frame are larger than data symbol protecting intervals in wanted data areas of each OFDM transmission frame. The length of data symbol protecting intervals is determined during demodulation and data symbol scanning times are then determined depending on the thus determined length of the protecting intervals.
CA002194394A 1994-07-20 1995-07-20 Control symbol and data symbol guard intervals with different time lengths in cofdm transmission frames Expired - Lifetime CA2194394C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEP4425713.9 1994-07-20
DE4425713A DE4425713C1 (en) 1994-07-20 1994-07-20 Method for multi-carrier modulation and demodulation of digitally coded data
PCT/EP1995/002868 WO1996002989A1 (en) 1994-07-20 1995-07-20 Multiple carrier transmission in common wave broadcasting networks

Publications (2)

Publication Number Publication Date
CA2194394A1 true CA2194394A1 (en) 1996-02-01
CA2194394C CA2194394C (en) 2001-12-25

Family

ID=6523700

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002194394A Expired - Lifetime CA2194394C (en) 1994-07-20 1995-07-20 Control symbol and data symbol guard intervals with different time lengths in cofdm transmission frames

Country Status (15)

Country Link
US (1) US6115354A (en)
EP (1) EP0771497B1 (en)
JP (1) JP2901018B2 (en)
KR (1) KR100335035B1 (en)
AT (1) ATE170685T1 (en)
AU (1) AU681806B2 (en)
CA (1) CA2194394C (en)
CZ (1) CZ286082B6 (en)
DE (2) DE4425713C1 (en)
DK (1) DK0771497T3 (en)
ES (1) ES2121410T3 (en)
FI (1) FI114263B (en)
HU (1) HU215892B (en)
PL (1) PL177232B1 (en)
WO (1) WO1996002989A1 (en)

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Also Published As

Publication number Publication date
ATE170685T1 (en) 1998-09-15
DE4425713C1 (en) 1995-04-20
WO1996002989A1 (en) 1996-02-01
HU9603628D0 (en) 1997-02-28
FI114263B (en) 2004-09-15
JPH09512156A (en) 1997-12-02
EP0771497B1 (en) 1998-09-02
AU3162795A (en) 1996-02-16
CZ369796A3 (en) 1997-04-16
CA2194394C (en) 2001-12-25
JP2901018B2 (en) 1999-06-02
HUT77417A (en) 1998-04-28
AU681806B2 (en) 1997-09-04
KR100335035B1 (en) 2002-11-22
DK0771497T3 (en) 1999-06-07
HU215892B (en) 1999-03-29
CZ286082B6 (en) 2000-01-12
US6115354A (en) 2000-09-05
ES2121410T3 (en) 1998-11-16
KR970705264A (en) 1997-09-06
PL318348A1 (en) 1997-06-09
EP0771497A1 (en) 1997-05-07
FI970204A (en) 1997-01-17
DE59503453D1 (en) 1998-10-08
FI970204A0 (en) 1997-01-17
PL177232B1 (en) 1999-10-29

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